1 /*!\file inc/netinet/if_ether.h
2 * Ethernet definitions.
5 /* Modified for emx by hv 1994
7 * Copyright (c) 1982, 1986 Regents of the University of California.
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11 * modification, are permitted provided that the following conditions
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20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
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26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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38 * from: @(#)if_ether.h 7.5 (Berkeley) 6/28/90
39 * $Id: if_ether.h,v 1.8 1994/02/02 05:58:54 hpeyerl Exp $
42 #ifndef __NETINET_IF_ETHER_H
43 #define __NETINET_IF_ETHER_H
45 #include <sys/packon.h>
48 * Ethernet address - 6 octets
49 * this is only used by the ethers(3) functions.
52 u_char ether_addr_octet[6];
56 * Structure of a 10Mb/s Ethernet header.
59 u_char ether_dhost[6];
60 u_char ether_shost[6];
64 #define ETHERTYPE_PUP 0x0200 /* PUP protocol */
65 /* the IBM header corrects the following to 0x608 for OS/2 but I believe
66 * this is just a dirty hack
68 #define ETHERTYPE_ARP 0x0806 /* address resolution protocol */
69 #define ETHERTYPE_IP 0x0800 /* IP protocol */
70 #define ETHERTYPE_REVARP 0x8035 /* reverse addr resolution protocol */
73 * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
74 * (type-ETHERTYPE_TRAIL)*512 bytes of data followed
75 * by an ETHER type (as given above) and then the (variable-length) header.
77 #define ETHERTYPE_TRAIL 0x1000 /* Trailer packet */
78 #define ETHERTYPE_NTRAILER 16
81 #define ETHERMIN (60-14)
84 * Macro to map an IP multicast address to an Ethernet multicast address.
85 * The high-order 25 bits of the Ethernet address are statically assigned,
86 * and the low-order 23 bits are taken from the low end of the IP address.
88 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \
89 /* struct in_addr *ipaddr; */ \
90 /* u_char enaddr[6]; */ \
95 (enaddr)[3] = ((u_char *)ipaddr)[1] & 0x7f; \
96 (enaddr)[4] = ((u_char *)ipaddr)[2]; \
97 (enaddr)[5] = ((u_char *)ipaddr)[3]; \
102 * Ethernet Address Resolution Protocol.
104 * See RFC 826 for protocol description. Structure below is adapted
105 * to resolving internet addresses. Field names used correspond to
109 struct arphdr ea_hdr; /* fixed-size header */
110 u_char arp_sha[6]; /* sender hardware address */
111 u_char arp_spa[4]; /* sender protocol address */
112 u_char arp_tha[6]; /* target hardware address */
113 u_char arp_tpa[4]; /* target protocol address */
115 #define arp_hrd ea_hdr.ar_hrd
116 #define arp_pro ea_hdr.ar_pro
117 #define arp_hln ea_hdr.ar_hln
118 #define arp_pln ea_hdr.ar_pln
119 #define arp_op ea_hdr.ar_op
123 * Structure shared between the ethernet driver modules and
124 * the address resolution code. For example, each ec_softc or il_softc
125 * begins with this structure.
128 struct ifnet ac_if; /* network-visible interface */
129 u_char ac_enaddr[6]; /* ethernet hardware address */
130 struct in_addr ac_ipaddr; /* copy of ip address- XXX */
131 struct ether_multi *ac_multiaddrs; /* list of ether multicast addrs */
132 int ac_multicnt; /* length of ac_multiaddrs list */
136 * Internet to ethernet address resolution table.
140 struct in_addr at_iaddr; /* internet address */
141 u_char at_enaddr[6]; /* ethernet address */
142 u_char at_timer; /* minutes since last reference */
143 u_char at_flags; /* flags */
144 struct mbuf *at_hold; /* last packet until resolved/timeout */
153 extern u_char etherbroadcastaddr[6];
154 extern u_char ether_ipmulticast_min[6];
155 extern u_char ether_ipmulticast_max[6];
158 * Ethernet multicast address structure. There is one of these for each
159 * multicast address or range of multicast addresses that we are supposed
160 * to listen to on a particular interface. They are kept in a linked list,
161 * rooted in the interface's arpcom structure. (This really has nothing to
162 * do with ARP, or with the Internet address family, but this appears to be
163 * the minimally-disrupting place to put it.)
166 u_char enm_addrlo[6]; /* low or only address of range */
167 u_char enm_addrhi[6]; /* high or only address of range */
168 struct arpcom *enm_ac; /* back pointer to arpcom */
169 u_int enm_refcount; /* no. claims to this addr/range */
170 struct ether_multi *enm_next; /* ptr to next ether_multi */
174 * Structure used by macros below to remember position when stepping through
175 * all of the ether_multi records.
177 struct ether_multistep {
178 struct ether_multi *e_enm;
181 #include <sys/packoff.h>
184 * Macro for looking up the ether_multi record for a given range of Ethernet
185 * multicast addresses connected to a given arpcom structure. If no matching
186 * record is found, "enm" returns NULL.
188 #define ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm) \
189 /* u_char addrlo[6]; */ \
190 /* u_char addrhi[6]; */ \
191 /* struct arpcom *ac; */ \
192 /* struct ether_multi *enm; */ \
194 for ((enm) = (ac)->ac_multiaddrs; \
196 (bcmp((enm)->enm_addrlo, (addrlo), 6) != 0 || \
197 bcmp((enm)->enm_addrhi, (addrhi), 6) != 0); \
198 (enm) = (enm)->enm_next); \
202 * Macro to step through all of the ether_multi records, one at a time.
203 * The current position is remembered in "step", which the caller must
204 * provide. ETHER_FIRST_MULTI(), below, must be called to initialize "step"
205 * and get the first record. Both macros return a NULL "enm" when there
206 * are no remaining records.
208 #define ETHER_NEXT_MULTI(step, enm) \
209 /* struct ether_multistep step; */ \
210 /* struct ether_multi *enm; */ \
212 if (((enm) = (step).e_enm) != NULL) \
213 (step).e_enm = (enm)->enm_next; \
216 #define ETHER_FIRST_MULTI(step, ac, enm) \
217 /* struct ether_multistep step; */ \
218 /* struct arpcom *ac; */ \
219 /* struct ether_multi *enm; */ \
221 (step).e_enm = (ac)->ac_multiaddrs; \
222 ETHER_NEXT_MULTI((step), (enm)); \